Invoice creation(automatic) after PGI done

My requirement is create VF01 invoice immediately after pgi done in system ( not using Manually VF01 transaction).

How can i proceed . Is there any enhancement point / BAdi in tcode VL02N which confirms that pgi has been done and saved in database table so that at that point transaction VF01 can we called in VL02N.

Or any other way, please suggest the way...

Thanks